Certified reference materials (CRM 408 and 409) for quality control of main components (ammonium, calcium, hydronium, magnesium, nitrate, potassium, sodium and sulphate) in simulated rain water

Reijnders, H. F. R.; Quevauviller, Philippe; Renterghem, D. Van; Griepink, B.; Jagt, Helga van der

doi:10.1007/bf00325309

Cited by 18 publications

(9 citation statements)

References 3 publications

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“…They have to preserve the composition of the sample from losses due to adsorption and volatilization, from contamination by foreign substances and reaction between constituents of the sample and the container. 4,5 For the selection of the sample container, It is advisable to carry out preliminary tests on the sorption and resorption properties and stability of the elements in the solution.…”

Section: Homogenisation System and Sample Containersmentioning

confidence: 99%

“…Ampoules do not present such risks and certainly represent the best choice for storing water CRMs; one drawback is related to the opening of the ampoule, which requires particular care; another drawback is that ampoules do not allow large volumes to be stored (maximum 200-300 ml), as have been for rainwater, groundwater and freshwater CRMs. [4][5][6]…”

Section: Homogenisation System and Sample Containersmentioning

confidence: 99%

“…An important aspect is the prevention of microorganisms for minimising microbial changes (e.g., in oxidation state or nutrient state); soaking with hydrogen peroxide (e.g., 3%, 8.8 mol l 21 ) has been used succesfully for this purpose. 5,6 Tests need to be carried out to guarantee the absence of microorganisms, e.g., by examination of samples of the last rinsing water and from the walls of the tank for their bacteriological content. Sterilisation of glass ampoules at 180 °C for 45 min has been used to prevent bacterial contamination during storage for filling.…”

Section: Cleaning Proceduresmentioning

confidence: 99%

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General considerations on the preparation of water certified reference materials†

Benoliel¹,

Quevauviller²

1998

Analyst

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A high degree of consistency in water measurements and analyses performed within European laboratories is essential for the implementation of European Directives. In order to support Community policies, the Standards, Measurements and Testing Programme (SM&T) of the European Commission encourages and supports technical collaboration between the laboratories of EC MemberStates through the organisation of interlaboratory studies and the production of certified reference materials (CRMs). This paper provides an overview of the requirements to be taken into account in the preparation of water CRMs. Preliminary tests carried out for the production of new groundwater CRMs are presented.

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Section: Homogenisation System and Sample Containersmentioning

confidence: 99%

Section: Homogenisation System and Sample Containersmentioning

confidence: 99%

Section: Cleaning Proceduresmentioning

confidence: 99%

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General considerations on the preparation of water certified reference materials†

Benoliel¹,

Quevauviller²

1998

Analyst

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“…23 Regarding the state-of-art in reference materials certification, as appeared in ISO Guide 35 2 and some BCR publications [15][16][17][18][19][20][21] concerning the homogeneity study, ANOVA and Ftest are normally used to determine the discrepancy between the variances of within-and between-bottle homogeneity. In the present work, all parameters concerned will be estimated by one-way analysis of variance (ANOVA) using the data analysis tool in the Microsoft-Excel program at a significance level of α = 0.05 or otherwise indicated.…”

Section: Homogeneity Studymentioning

confidence: 99%

“…The coefficient variation (CV) and uncertainty of CV (U cv ) were evaluated following the BCR' s reports [15][16][17][18][19][20][21] using Equation 2…”

Section: Procedures For Homogeneity Studymentioning

confidence: 99%

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Chuachuad¹,

Shiowatana²,

Chukanchanapituk³

et al. 2002

ScienceAsia

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An in-house reference material for trace metals in rice flour was produced. Certification of concentrations of fifteen elements based on at least two independent methods was carried out. The analytical techniques included ICP-AES, ICP-MS, ETAAS, FAAS and voltammetry. Out of the 15 elements, 13 elements, namely Na, K, Mg, Ca, Ba, Cu, Zn, Fe Mn, Co, Ni, Pb and Cd, could be certified whereas only reference values were given to Cr and V because the concentrations of these two elements were so low that only one analysis method could successfully detect them. Statistical tests for the study of homogeneity at 95 % confidence level did not reveal significant differences between the within-bottle and between-bottle variation. The rice flour material is considered to be homogeneous at 250-650 mg sample sizes. No significant change was observed in a long-term stability study of the material over a period of 5 months and a short-term stability study at an elevated temperature of 50 °C for a period of 5 weeks. A comparison of results obtained from independent methods was made before certified values were calculated using both means and weighted means. The reference materials have been distributed for use in laboratory quality assurance.

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Reference Materials

2002

Water Quality Measurements

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Certified reference materials (CRM 408 and 409) for quality control of main components (ammonium, calcium, hydronium, magnesium, nitrate, potassium, sodium and sulphate) in simulated rain water

Cited by 18 publications

References 3 publications

General considerations on the preparation of water certified reference materials†

General considerations on the preparation of water certified reference materials†

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